These replacement Extreme Q Glass Whip Mouthpiece for the 3" vapor whip on your Arizer Extreme Q 4.0 Vaporizer are essential if you have either lost or broken your whip mouthpiece. Even if you haven't broken or lost the mouthpiece that the Extreme Q whip came with it is great to have a spare while you are cleaning your original. This glass mouthpiece also fits on the Arizer V-Tower vapor whip.